The next factor in a site evaluation is permeability.
Permeability refers to the ability of a soil site to drain and breathe. Basically, can it operate like a sponge? The texture, structure, and profile density make up the determinants of permeability.
A simple framework to apply goes as follows.
Rapid - Course or gravelly soils are obviously in the site. Water does not sit around long. In addition, fertility leaches with it if a large amount of humus and organic matter is not present. These factors limit agriculture and engineering use. Fertility and moisture retention is an issue.
Moderate- friable and firm texture exists with a mixture of moderately coarse to moderately fine soil particles. Water can move from to to bottom, with little restriction. Formations can be squarish and blocky. Moisture and fair movement are adequate. There is enough moisture held to aid plant growth during droughts. Uses are well-rounded in this type.
Slow- Soils may be packed and firm. Grey souring mottles of the soil profile will show up in the top 2 ft. That means poor airflow. Some uses are moderately limited on this site.
Very slow- Dese fine textures are present. Clay is the thought. When dug large clods are held together. Some uses are moderately limited on this site.
When you think of limitations reflect on what the soil is needed for. Do you need a septic tank? What crops do you want to grow?
Organic matter can change permeability when life mixes it in.
Good luck.
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